155151221552402 has 4 divisors (see below), whose sum is σ = 232726832328606. Its totient is φ = 77575610776200.

The previous prime is 155151221552363. The next prime is 155151221552449. The reversal of 155151221552402 is 204255122151551.

155151221552402 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 109885762334881 + 45265459217521 = 10482641^2 + 6727961^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155151221552402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38787805388099 + ... + 38787805388102.

Almost surely, 2^{155151221552402} is an apocalyptic number.

155151221552402 is a deficient number, since it is larger than the sum of its proper divisors (77575610776204).

155151221552402 is an equidigital number, since it uses as much as digits as its factorization.

155151221552402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77575610776203.

The product of its (nonzero) digits is 200000, while the sum is 41.

The spelling of 155151221552402 in words is "one hundred fifty-five trillion, one hundred fifty-one billion, two hundred twenty-one million, five hundred fifty-two thousand, four hundred two".